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d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/mman.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/wait.h> | |
35 | #include <inttypes.h> | |
36 | #include <urcu/futex.h> | |
37 | #include <urcu/uatomic.h> | |
38 | #include <unistd.h> | |
39 | #include <fcntl.h> | |
40 | #include <config.h> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | #include <common/common.h> | |
44 | #include <common/compat/poll.h> | |
45 | #include <common/compat/socket.h> | |
46 | #include <common/defaults.h> | |
47 | #include <common/futex.h> | |
48 | #include <common/sessiond-comm/sessiond-comm.h> | |
49 | #include <common/sessiond-comm/inet.h> | |
50 | #include <common/sessiond-comm/relayd.h> | |
51 | #include <common/uri.h> | |
52 | #include <common/utils.h> | |
53 | ||
54 | #include "cmd.h" | |
55 | #include "live.h" | |
56 | #include "lttng-relayd.h" | |
57 | #include "lttng-viewer.h" | |
58 | #include "utils.h" | |
59 | ||
60 | static struct lttng_uri *live_uri; | |
61 | ||
62 | /* | |
63 | * Quit pipe for all threads. This permits a single cancellation point | |
64 | * for all threads when receiving an event on the pipe. | |
65 | */ | |
66 | static int live_thread_quit_pipe[2] = { -1, -1 }; | |
67 | ||
68 | /* | |
69 | * This pipe is used to inform the worker thread that a command is queued and | |
70 | * ready to be processed. | |
71 | */ | |
72 | static int live_relay_cmd_pipe[2] = { -1, -1 }; | |
73 | ||
74 | /* Shared between threads */ | |
75 | static int live_dispatch_thread_exit; | |
76 | ||
77 | static pthread_t live_listener_thread; | |
78 | static pthread_t live_dispatcher_thread; | |
79 | static pthread_t live_worker_thread; | |
80 | ||
81 | /* | |
82 | * Relay command queue. | |
83 | * | |
84 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
85 | * queue. | |
86 | */ | |
87 | static struct relay_cmd_queue viewer_cmd_queue; | |
88 | ||
89 | static uint64_t last_relay_viewer_session_id; | |
90 | ||
91 | /* | |
92 | * Cleanup the daemon | |
93 | */ | |
94 | static | |
95 | void cleanup(void) | |
96 | { | |
97 | DBG("Cleaning up"); | |
98 | ||
99 | /* Close thread quit pipes */ | |
100 | utils_close_pipe(live_thread_quit_pipe); | |
101 | free(live_uri); | |
102 | } | |
103 | ||
104 | /* | |
105 | * Write to writable pipe used to notify a thread. | |
106 | */ | |
107 | static | |
108 | int notify_thread_pipe(int wpipe) | |
109 | { | |
110 | int ret; | |
111 | ||
112 | do { | |
113 | ret = write(wpipe, "!", 1); | |
114 | } while (ret < 0 && errno == EINTR); | |
115 | if (ret < 0 || ret != 1) { | |
116 | PERROR("write poll pipe"); | |
117 | } | |
118 | ||
119 | return ret; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Stop all threads by closing the thread quit pipe. | |
124 | */ | |
125 | static | |
126 | void stop_threads(void) | |
127 | { | |
128 | int ret; | |
129 | ||
130 | /* Stopping all threads */ | |
131 | DBG("Terminating all live threads"); | |
132 | ret = notify_thread_pipe(live_thread_quit_pipe[1]); | |
133 | if (ret < 0) { | |
134 | ERR("write error on thread quit pipe"); | |
135 | } | |
136 | ||
137 | /* Dispatch thread */ | |
138 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
139 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
140 | } | |
141 | ||
142 | /* | |
143 | * Init thread quit pipe. | |
144 | * | |
145 | * Return -1 on error or 0 if all pipes are created. | |
146 | */ | |
147 | static | |
148 | int init_thread_quit_pipe(void) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | ret = utils_create_pipe_cloexec(live_thread_quit_pipe); | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
159 | */ | |
160 | static | |
161 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | if (events == NULL || size == 0) { | |
166 | ret = -1; | |
167 | goto error; | |
168 | } | |
169 | ||
170 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
171 | if (ret < 0) { | |
172 | goto error; | |
173 | } | |
174 | ||
175 | /* Add quit pipe */ | |
176 | ret = lttng_poll_add(events, live_thread_quit_pipe[0], LPOLLIN); | |
177 | if (ret < 0) { | |
178 | goto error; | |
179 | } | |
180 | ||
181 | return 0; | |
182 | ||
183 | error: | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Check if the thread quit pipe was triggered. | |
189 | * | |
190 | * Return 1 if it was triggered else 0; | |
191 | */ | |
192 | static | |
193 | int check_thread_quit_pipe(int fd, uint32_t events) | |
194 | { | |
195 | if (fd == live_thread_quit_pipe[0] && (events & LPOLLIN)) { | |
196 | return 1; | |
197 | } | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Create and init socket from uri. | |
204 | */ | |
205 | static | |
206 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
207 | { | |
208 | int ret; | |
209 | struct lttcomm_sock *sock = NULL; | |
210 | ||
211 | sock = lttcomm_alloc_sock_from_uri(uri); | |
212 | if (sock == NULL) { | |
213 | ERR("Allocating socket"); | |
214 | goto error; | |
215 | } | |
216 | ||
217 | ret = lttcomm_create_sock(sock); | |
218 | if (ret < 0) { | |
219 | goto error; | |
220 | } | |
221 | DBG("Listening on sock %d for live", sock->fd); | |
222 | ||
223 | ret = sock->ops->bind(sock); | |
224 | if (ret < 0) { | |
225 | goto error; | |
226 | } | |
227 | ||
228 | ret = sock->ops->listen(sock, -1); | |
229 | if (ret < 0) { | |
230 | goto error; | |
231 | ||
232 | } | |
233 | ||
234 | return sock; | |
235 | ||
236 | error: | |
237 | if (sock) { | |
238 | lttcomm_destroy_sock(sock); | |
239 | } | |
240 | return NULL; | |
241 | } | |
242 | ||
243 | /* | |
244 | * This thread manages the listening for new connections on the network | |
245 | */ | |
246 | static | |
247 | void *thread_listener(void *data) | |
248 | { | |
249 | int i, ret, pollfd, err = -1; | |
250 | int val = 1; | |
251 | uint32_t revents, nb_fd; | |
252 | struct lttng_poll_event events; | |
253 | struct lttcomm_sock *live_control_sock; | |
254 | ||
255 | DBG("[thread] Relay live listener started"); | |
256 | ||
257 | live_control_sock = init_socket(live_uri); | |
258 | if (!live_control_sock) { | |
259 | goto error_sock_control; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
264 | */ | |
265 | ret = create_thread_poll_set(&events, 2); | |
266 | if (ret < 0) { | |
267 | goto error_create_poll; | |
268 | } | |
269 | ||
270 | /* Add the control socket */ | |
271 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
272 | if (ret < 0) { | |
273 | goto error_poll_add; | |
274 | } | |
275 | ||
276 | while (1) { | |
277 | DBG("Listener accepting live viewers connections"); | |
278 | ||
279 | restart: | |
280 | ret = lttng_poll_wait(&events, -1); | |
281 | if (ret < 0) { | |
282 | /* | |
283 | * Restart interrupted system call. | |
284 | */ | |
285 | if (errno == EINTR) { | |
286 | goto restart; | |
287 | } | |
288 | goto error; | |
289 | } | |
290 | nb_fd = ret; | |
291 | ||
292 | DBG("Relay new viewer connection received"); | |
293 | for (i = 0; i < nb_fd; i++) { | |
294 | /* Fetch once the poll data */ | |
295 | revents = LTTNG_POLL_GETEV(&events, i); | |
296 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
297 | ||
298 | /* Thread quit pipe has been closed. Killing thread. */ | |
299 | ret = check_thread_quit_pipe(pollfd, revents); | |
300 | if (ret) { | |
301 | err = 0; | |
302 | goto exit; | |
303 | } | |
304 | ||
305 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
306 | ERR("socket poll error"); | |
307 | goto error; | |
308 | } else if (revents & LPOLLIN) { | |
309 | /* | |
310 | * Get allocated in this thread, enqueued to a global queue, | |
311 | * dequeued and freed in the worker thread. | |
312 | */ | |
313 | struct relay_command *relay_cmd; | |
314 | struct lttcomm_sock *newsock; | |
315 | ||
316 | relay_cmd = zmalloc(sizeof(*relay_cmd)); | |
317 | if (!relay_cmd) { | |
318 | PERROR("relay command zmalloc"); | |
319 | goto error; | |
320 | } | |
321 | ||
322 | assert(pollfd == live_control_sock->fd); | |
323 | newsock = live_control_sock->ops->accept(live_control_sock); | |
324 | if (!newsock) { | |
325 | PERROR("accepting control sock"); | |
326 | free(relay_cmd); | |
327 | goto error; | |
328 | } | |
329 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
330 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, | |
331 | sizeof(int)); | |
332 | if (ret < 0) { | |
333 | PERROR("setsockopt inet"); | |
334 | lttcomm_destroy_sock(newsock); | |
335 | free(relay_cmd); | |
336 | goto error; | |
337 | } | |
338 | relay_cmd->sock = newsock; | |
339 | ||
340 | /* | |
341 | * Lock free enqueue the request. | |
342 | */ | |
343 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); | |
344 | ||
345 | /* | |
346 | * Wake the dispatch queue futex. Implicit memory | |
347 | * barrier with the exchange in cds_wfq_enqueue. | |
348 | */ | |
349 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
350 | } | |
351 | } | |
352 | } | |
353 | ||
354 | exit: | |
355 | error: | |
356 | error_poll_add: | |
357 | lttng_poll_clean(&events); | |
358 | error_create_poll: | |
359 | if (live_control_sock->fd >= 0) { | |
360 | ret = live_control_sock->ops->close(live_control_sock); | |
361 | if (ret) { | |
362 | PERROR("close"); | |
363 | } | |
364 | } | |
365 | lttcomm_destroy_sock(live_control_sock); | |
366 | error_sock_control: | |
367 | if (err) { | |
368 | DBG("Live viewer listener thread exited with error"); | |
369 | } | |
370 | DBG("Live viewer listener thread cleanup complete"); | |
371 | stop_threads(); | |
372 | return NULL; | |
373 | } | |
374 | ||
375 | /* | |
376 | * This thread manages the dispatching of the requests to worker threads | |
377 | */ | |
378 | static | |
379 | void *thread_dispatcher(void *data) | |
380 | { | |
381 | int ret; | |
382 | struct cds_wfq_node *node; | |
383 | struct relay_command *relay_cmd = NULL; | |
384 | ||
385 | DBG("[thread] Live viewer relay dispatcher started"); | |
386 | ||
387 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { | |
388 | /* Atomically prepare the queue futex */ | |
389 | futex_nto1_prepare(&viewer_cmd_queue.futex); | |
390 | ||
391 | do { | |
392 | /* Dequeue commands */ | |
393 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); | |
394 | if (node == NULL) { | |
395 | DBG("Woken up but nothing in the live-viewer " | |
396 | "relay command queue"); | |
397 | /* Continue thread execution */ | |
398 | break; | |
399 | } | |
400 | ||
401 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
402 | DBG("Dispatching viewer request waiting on sock %d", | |
403 | relay_cmd->sock->fd); | |
404 | ||
405 | /* | |
406 | * Inform worker thread of the new request. This call is blocking | |
407 | * so we can be assured that the data will be read at some point in | |
408 | * time or wait to the end of the world :) | |
409 | */ | |
410 | do { | |
411 | ret = write(live_relay_cmd_pipe[1], relay_cmd, | |
412 | sizeof(*relay_cmd)); | |
413 | } while (ret < 0 && errno == EINTR); | |
414 | free(relay_cmd); | |
415 | if (ret < 0 || ret != sizeof(struct relay_command)) { | |
416 | PERROR("write cmd pipe"); | |
417 | goto error; | |
418 | } | |
419 | } while (node != NULL); | |
420 | ||
421 | /* Futex wait on queue. Blocking call on futex() */ | |
422 | futex_nto1_wait(&viewer_cmd_queue.futex); | |
423 | } | |
424 | ||
425 | error: | |
426 | DBG("Live viewer dispatch thread dying"); | |
427 | stop_threads(); | |
428 | return NULL; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Establish connection with the viewer and check the versions. | |
433 | * | |
434 | * Return 0 on success or else negative value. | |
435 | */ | |
436 | static | |
437 | int viewer_connect(struct relay_command *cmd) | |
438 | { | |
439 | int ret; | |
440 | struct lttng_viewer_connect reply, msg; | |
441 | ||
442 | assert(cmd); | |
443 | ||
444 | cmd->version_check_done = 1; | |
445 | ||
446 | /* Get version from the other side. */ | |
447 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
448 | if (ret < 0 || ret != sizeof(msg)) { | |
449 | if (ret == 0) { | |
450 | /* Orderly shutdown. Not necessary to print an error. */ | |
451 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
452 | } else { | |
453 | ERR("Relay failed to receive the version values."); | |
454 | } | |
455 | ret = -1; | |
456 | goto end; | |
457 | } | |
458 | ||
459 | reply.major = RELAYD_VERSION_COMM_MAJOR; | |
460 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
461 | ||
462 | /* Major versions must be the same */ | |
463 | if (reply.major != be32toh(msg.major)) { | |
464 | DBG("Incompatible major versions (%u vs %u)", reply.major, | |
465 | be32toh(msg.major)); | |
466 | ret = 0; | |
467 | goto end; | |
468 | } | |
469 | ||
470 | cmd->major = reply.major; | |
471 | /* We adapt to the lowest compatible version */ | |
472 | if (reply.minor <= be32toh(msg.minor)) { | |
473 | cmd->minor = reply.minor; | |
474 | } else { | |
475 | cmd->minor = be32toh(msg.minor); | |
476 | } | |
477 | ||
478 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
479 | cmd->type = RELAY_VIEWER_COMMAND; | |
480 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { | |
481 | cmd->type = RELAY_VIEWER_NOTIFICATION; | |
482 | } else { | |
483 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
484 | ret = -1; | |
485 | goto end; | |
486 | } | |
487 | ||
488 | reply.major = htobe32(reply.major); | |
489 | reply.minor = htobe32(reply.minor); | |
490 | if (cmd->type == RELAY_VIEWER_COMMAND) { | |
491 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); | |
492 | } | |
493 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
494 | sizeof(struct lttng_viewer_connect), 0); | |
495 | if (ret < 0) { | |
496 | ERR("Relay sending version"); | |
497 | } | |
498 | ||
499 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); | |
500 | ret = 0; | |
501 | ||
502 | end: | |
503 | return ret; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Send the viewer the list of current sessions. | |
508 | * | |
509 | * Return 0 on success or else a negative value. | |
510 | */ | |
511 | static | |
512 | int viewer_list_sessions(struct relay_command *cmd, | |
513 | struct lttng_ht *sessions_ht) | |
514 | { | |
515 | int ret; | |
516 | struct lttng_viewer_list_sessions session_list; | |
517 | unsigned long count; | |
518 | long approx_before, approx_after; | |
519 | struct lttng_ht_node_ulong *node; | |
520 | struct lttng_ht_iter iter; | |
521 | struct lttng_viewer_session send_session; | |
522 | struct relay_session *session; | |
523 | ||
524 | DBG("List sessions received"); | |
525 | ||
526 | if (cmd->version_check_done == 0) { | |
527 | ERR("Trying to list sessions before version check"); | |
528 | ret = -1; | |
529 | goto end_no_session; | |
530 | } | |
531 | ||
532 | rcu_read_lock(); | |
533 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); | |
534 | session_list.sessions_count = htobe32(count); | |
535 | ||
536 | ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, | |
537 | sizeof(session_list), 0); | |
538 | if (ret < 0) { | |
539 | ERR("Relay sending sessions list"); | |
540 | goto end_unlock; | |
541 | } | |
542 | ||
543 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { | |
544 | node = lttng_ht_iter_get_node_ulong(&iter); | |
545 | if (!node) { | |
546 | goto end_unlock; | |
547 | } | |
548 | session = caa_container_of(node, struct relay_session, session_n); | |
549 | ||
550 | strncpy(send_session.session_name, session->session_name, | |
551 | sizeof(send_session.session_name)); | |
552 | strncpy(send_session.hostname, session->hostname, | |
553 | sizeof(send_session.hostname)); | |
554 | send_session.id = htobe64(session->id); | |
555 | send_session.live_timer = htobe32(session->live_timer); | |
556 | send_session.clients = htobe32(session->viewer_attached); | |
557 | ||
558 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, | |
559 | sizeof(send_session), 0); | |
560 | if (ret < 0) { | |
561 | ERR("Relay sending session info"); | |
562 | goto end_unlock; | |
563 | } | |
564 | } | |
565 | rcu_read_unlock(); | |
566 | ret = 0; | |
567 | goto end; | |
568 | ||
569 | end_unlock: | |
570 | rcu_read_unlock(); | |
571 | ||
572 | end: | |
573 | end_no_session: | |
574 | return ret; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Allocate and init a new viewer_stream. | |
579 | * | |
580 | * Copies the values from the stream passed in parameter and insert the new | |
581 | * stream in the viewer_streams_ht. | |
582 | * | |
583 | * MUST be called with rcu_read_lock held. | |
584 | * | |
585 | * Returns 0 on success or a negative value on error. | |
586 | */ | |
587 | static | |
92c6ca54 | 588 | int init_viewer_stream(struct relay_stream *stream) |
d3e2ba59 JD |
589 | { |
590 | int ret; | |
591 | struct relay_viewer_stream *viewer_stream; | |
592 | ||
593 | assert(stream); | |
d3e2ba59 JD |
594 | |
595 | viewer_stream = zmalloc(sizeof(*viewer_stream)); | |
596 | if (!viewer_stream) { | |
597 | PERROR("relay viewer stream zmalloc"); | |
598 | ret = -1; | |
599 | goto error; | |
600 | } | |
601 | ||
602 | viewer_stream->read_fd = -1; | |
603 | viewer_stream->index_read_fd = -1; | |
604 | viewer_stream->session_id = stream->session->id; | |
605 | viewer_stream->stream_handle = stream->stream_handle; | |
606 | viewer_stream->path_name = strndup(stream->path_name, | |
607 | LTTNG_VIEWER_PATH_MAX); | |
608 | viewer_stream->channel_name = strndup(stream->channel_name, | |
609 | LTTNG_VIEWER_NAME_MAX); | |
610 | viewer_stream->total_index_received = stream->total_index_received; | |
611 | viewer_stream->tracefile_size = stream->tracefile_size; | |
612 | viewer_stream->tracefile_count = stream->tracefile_count; | |
613 | viewer_stream->metadata_flag = stream->metadata_flag; | |
614 | ||
615 | /* | |
616 | * This is to avoid a race between the initialization of this object and | |
617 | * the close of the given stream. If the stream is unable to find this | |
618 | * viewer stream when closing, this copy will at least take the latest | |
619 | * value. | |
620 | */ | |
621 | viewer_stream->total_index_received = stream->total_index_received; | |
622 | ||
623 | /* | |
624 | * The deletion of this ctf_trace object is only done in a call RCU of the | |
625 | * relay stream making it valid as long as we have the read side lock. | |
626 | */ | |
627 | viewer_stream->ctf_trace = stream->ctf_trace; | |
628 | uatomic_inc(&viewer_stream->ctf_trace->refcount); | |
629 | ||
630 | lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); | |
631 | lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); | |
632 | ||
633 | ret = 0; | |
634 | ||
635 | error: | |
636 | return ret; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Send the viewer the list of current sessions. | |
641 | */ | |
642 | static | |
643 | int viewer_attach_session(struct relay_command *cmd, | |
92c6ca54 | 644 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
645 | { |
646 | int ret, send_streams = 0, nb_streams = 0; | |
647 | struct lttng_viewer_attach_session_request request; | |
648 | struct lttng_viewer_attach_session_response response; | |
649 | struct lttng_viewer_stream send_stream; | |
650 | struct relay_stream *stream; | |
651 | struct relay_viewer_stream *viewer_stream; | |
652 | struct lttng_ht_node_ulong *node; | |
653 | struct lttng_ht_node_u64 *node64; | |
654 | struct lttng_ht_iter iter; | |
655 | struct relay_session *session; | |
656 | ||
657 | assert(cmd); | |
658 | assert(sessions_ht); | |
d3e2ba59 JD |
659 | |
660 | DBG("Attach session received"); | |
661 | ||
662 | if (cmd->version_check_done == 0) { | |
663 | ERR("Trying to attach session before version check"); | |
664 | ret = -1; | |
665 | goto end_no_session; | |
666 | } | |
667 | ||
668 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); | |
669 | if (ret < 0 || ret != sizeof(request)) { | |
670 | if (ret == 0) { | |
671 | /* Orderly shutdown. Not necessary to print an error. */ | |
672 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
673 | } else { | |
674 | ERR("Relay failed to receive the attach parameters."); | |
675 | } | |
676 | ret = -1; | |
677 | goto error; | |
678 | } | |
679 | ||
680 | rcu_read_lock(); | |
681 | lttng_ht_lookup(sessions_ht, | |
682 | (void *)((unsigned long) be64toh(request.session_id)), &iter); | |
683 | node = lttng_ht_iter_get_node_ulong(&iter); | |
684 | if (node == NULL) { | |
685 | DBG("Relay session %" PRIu64 " not found", | |
686 | be64toh(request.session_id)); | |
687 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
688 | goto send_reply; | |
689 | } | |
690 | ||
691 | session = caa_container_of(node, struct relay_session, session_n); | |
692 | if (cmd->session == session) { | |
693 | /* Same viewer already attached, just send the stream list. */ | |
694 | send_streams = 1; | |
695 | response.status = htobe32(VIEWER_ATTACH_OK); | |
696 | } else if (session->viewer_attached != 0) { | |
697 | DBG("Already a viewer attached"); | |
698 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
699 | goto send_reply; | |
700 | } else if (session->live_timer == 0) { | |
701 | DBG("Not live session"); | |
702 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
703 | goto send_reply; | |
704 | } else { | |
705 | session->viewer_attached++; | |
706 | send_streams = 1; | |
707 | response.status = htobe32(VIEWER_ATTACH_OK); | |
708 | cmd->session = session; | |
709 | } | |
710 | ||
711 | switch (be32toh(request.seek)) { | |
712 | case VIEWER_SEEK_BEGINNING: | |
713 | /* Default behaviour. */ | |
714 | break; | |
715 | case VIEWER_SEEK_LAST: | |
716 | /* TODO */ | |
717 | break; | |
718 | default: | |
719 | ERR("Wrong seek parameter"); | |
720 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
721 | send_streams = 0; | |
722 | goto send_reply; | |
723 | } | |
724 | ||
725 | if (send_streams) { | |
726 | /* We should only be there if we have a session to attach to. */ | |
727 | assert(session); | |
728 | ||
729 | /* | |
730 | * Fill the viewer_streams_ht to count the number of streams | |
731 | * ready to be sent and avoid concurrency issues on the | |
732 | * relay_streams_ht and don't rely on a total session stream count. | |
733 | */ | |
734 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { | |
735 | struct relay_viewer_stream *vstream; | |
736 | ||
737 | node = lttng_ht_iter_get_node_ulong(&iter); | |
738 | if (!node) { | |
739 | continue; | |
740 | } | |
741 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
742 | if (stream->session != cmd->session) { | |
743 | continue; | |
744 | } | |
745 | ||
746 | /* | |
747 | * Don't send streams with no ctf_trace, they are not ready to be | |
748 | * read. | |
749 | */ | |
750 | if (!stream->ctf_trace) { | |
751 | continue; | |
752 | } | |
753 | ||
92c6ca54 | 754 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
d3e2ba59 | 755 | if (!vstream) { |
92c6ca54 | 756 | ret = init_viewer_stream(stream); |
d3e2ba59 JD |
757 | if (ret < 0) { |
758 | goto end_unlock; | |
759 | } | |
760 | } | |
761 | nb_streams++; | |
762 | } | |
763 | response.streams_count = htobe32(nb_streams); | |
764 | } | |
765 | ||
766 | send_reply: | |
767 | ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); | |
768 | if (ret < 0) { | |
769 | ERR("Relay sending viewer attach response"); | |
770 | goto end_unlock; | |
771 | } | |
772 | ||
773 | /* | |
774 | * Unknown or busy session, just return gracefully, the viewer knows what | |
775 | * is happening. | |
776 | */ | |
777 | if (!send_streams) { | |
778 | ret = 0; | |
779 | goto end_unlock; | |
780 | } | |
781 | ||
782 | /* We should only be there if we have a session to attach to. */ | |
783 | assert(session); | |
784 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
785 | node64 = lttng_ht_iter_get_node_u64(&iter); | |
786 | if (!node64) { | |
787 | continue; | |
788 | } | |
789 | viewer_stream = caa_container_of(node64, struct relay_viewer_stream, | |
790 | stream_n); | |
791 | if (viewer_stream->session_id != cmd->session->id) { | |
792 | continue; | |
793 | } | |
794 | ||
795 | send_stream.id = htobe64(viewer_stream->stream_handle); | |
796 | send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); | |
797 | send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); | |
798 | strncpy(send_stream.path_name, viewer_stream->path_name, | |
799 | sizeof(send_stream.path_name)); | |
800 | strncpy(send_stream.channel_name, viewer_stream->channel_name, | |
801 | sizeof(send_stream.channel_name)); | |
802 | ||
803 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, | |
804 | sizeof(send_stream), 0); | |
805 | if (ret < 0) { | |
806 | ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); | |
807 | goto end_unlock; | |
808 | } | |
809 | DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); | |
810 | } | |
811 | ret = 0; | |
812 | ||
813 | end_unlock: | |
814 | rcu_read_unlock(); | |
815 | end_no_session: | |
816 | error: | |
817 | return ret; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Open index file using a given viewer stream. | |
822 | * | |
823 | * Return 0 on success or else a negative value. | |
824 | */ | |
825 | static int open_index(struct relay_viewer_stream *stream) | |
826 | { | |
827 | int ret; | |
828 | char fullpath[PATH_MAX]; | |
829 | struct lttng_packet_index_file_hdr hdr; | |
830 | ||
831 | if (stream->tracefile_size > 0) { | |
832 | /* For now we don't support on-disk ring buffer. */ | |
833 | ret = -1; | |
834 | goto end; | |
835 | } else { | |
836 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR | |
837 | "/%s" DEFAULT_INDEX_FILE_SUFFIX, | |
838 | stream->path_name, stream->channel_name); | |
839 | if (ret < 0) { | |
840 | PERROR("snprintf index path"); | |
841 | goto error; | |
842 | } | |
843 | } | |
844 | ||
845 | DBG("Opening index file %s in read only", fullpath); | |
846 | ret = open(fullpath, O_RDONLY); | |
847 | if (ret < 0) { | |
848 | if (errno == ENOENT) { | |
849 | ret = ENOENT; | |
850 | goto error; | |
851 | } else { | |
852 | PERROR("opening index in read-only"); | |
853 | } | |
854 | goto error; | |
855 | } | |
856 | stream->index_read_fd = ret; | |
857 | DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); | |
858 | ||
859 | do { | |
860 | ret = read(stream->index_read_fd, &hdr, sizeof(hdr)); | |
861 | } while (ret < 0 && errno == EINTR); | |
862 | if (ret < 0) { | |
863 | PERROR("Reading index header"); | |
864 | goto error; | |
865 | } | |
866 | if (strncmp(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic)) != 0) { | |
867 | ERR("Invalid header magic"); | |
868 | ret = -1; | |
869 | goto error; | |
870 | } | |
871 | if (be32toh(hdr.index_major) != INDEX_MAJOR || | |
872 | be32toh(hdr.index_minor) != INDEX_MINOR) { | |
873 | ERR("Invalid header version"); | |
874 | ret = -1; | |
875 | goto error; | |
876 | } | |
877 | ret = 0; | |
878 | ||
879 | error: | |
880 | end: | |
881 | return ret; | |
882 | } | |
883 | ||
884 | /* | |
885 | * Get viewer stream from stream id. | |
886 | * | |
887 | * RCU read side lock MUST be acquired. | |
888 | */ | |
92c6ca54 | 889 | struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) |
d3e2ba59 JD |
890 | { |
891 | struct lttng_ht_node_u64 *node; | |
892 | struct lttng_ht_iter iter; | |
893 | struct relay_viewer_stream *stream = NULL; | |
894 | ||
d3e2ba59 JD |
895 | lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); |
896 | node = lttng_ht_iter_get_node_u64(&iter); | |
897 | if (node == NULL) { | |
898 | DBG("Relay viewer stream %" PRIu64 " not found", stream_id); | |
899 | goto end; | |
900 | } | |
901 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
902 | ||
903 | end: | |
904 | return stream; | |
905 | } | |
906 | ||
907 | /* | |
908 | * Send the next index for a stream. | |
909 | * | |
910 | * Return 0 on success or else a negative value. | |
911 | */ | |
912 | static | |
913 | int viewer_get_next_index(struct relay_command *cmd, | |
92c6ca54 | 914 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
915 | { |
916 | int ret; | |
917 | struct lttng_viewer_get_next_index request_index; | |
918 | struct lttng_viewer_index viewer_index; | |
919 | struct lttng_packet_index packet_index; | |
920 | struct relay_viewer_stream *vstream; | |
921 | struct relay_stream *rstream; | |
922 | ||
923 | assert(cmd); | |
d3e2ba59 JD |
924 | assert(sessions_ht); |
925 | ||
926 | DBG("Viewer get next index"); | |
927 | ||
928 | if (cmd->version_check_done == 0) { | |
929 | ERR("Trying to request index before version check"); | |
930 | ret = -1; | |
931 | goto end_no_session; | |
932 | } | |
933 | ||
934 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, | |
935 | sizeof(request_index), 0); | |
936 | if (ret < 0 || ret != sizeof(request_index)) { | |
937 | ret = -1; | |
938 | ERR("Relay didn't receive the whole packet"); | |
939 | goto end; | |
940 | } | |
941 | ||
942 | rcu_read_lock(); | |
92c6ca54 | 943 | vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
944 | if (!vstream) { |
945 | ret = -1; | |
946 | goto end_unlock; | |
947 | } | |
948 | ||
949 | memset(&viewer_index, 0, sizeof(viewer_index)); | |
950 | ||
951 | /* | |
952 | * The viewer should not ask for index on metadata stream. | |
953 | */ | |
954 | if (vstream->metadata_flag) { | |
955 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
956 | goto send_reply; | |
957 | } | |
958 | ||
959 | /* First time, we open the index file */ | |
960 | if (vstream->index_read_fd < 0) { | |
961 | ret = open_index(vstream); | |
962 | if (ret == ENOENT) { | |
963 | /* | |
964 | * The index is created only when the first data packet arrives, it | |
965 | * might not be ready at the beginning of the session | |
966 | */ | |
967 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
968 | goto send_reply; | |
969 | } else if (ret < 0) { | |
970 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
971 | goto send_reply; | |
972 | } | |
973 | } | |
974 | ||
975 | rstream = relay_stream_find_by_id(vstream->stream_handle); | |
976 | if (rstream) { | |
977 | if (rstream->beacon_ts_end != -1ULL && | |
978 | vstream->last_sent_index == rstream->total_index_received) { | |
979 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
980 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
981 | goto send_reply; | |
982 | } | |
983 | ||
984 | if (rstream->total_index_received <= vstream->last_sent_index) { | |
985 | /* No new index to send, retry later. */ | |
986 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
987 | goto send_reply; | |
988 | } | |
989 | } else if (!rstream && | |
990 | vstream->total_index_received == vstream->last_sent_index) { | |
991 | /* Last index sent and stream closed */ | |
992 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
993 | goto send_reply; | |
994 | } | |
995 | ||
996 | if (!vstream->ctf_trace->metadata_received || | |
997 | vstream->ctf_trace->metadata_received > | |
998 | vstream->ctf_trace->metadata_sent) { | |
999 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1000 | } | |
1001 | ||
1002 | do { | |
1003 | ret = read(vstream->index_read_fd, &packet_index, | |
1004 | sizeof(packet_index)); | |
1005 | } while (ret < 0 && errno == EINTR); | |
1006 | if (ret < sizeof(packet_index)) { | |
1007 | PERROR("Relay reading index file"); | |
1008 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1009 | } else { | |
1010 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
1011 | vstream->last_sent_index++; | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * Indexes are stored in big endian, no need to switch before sending. | |
1016 | */ | |
1017 | viewer_index.offset = packet_index.offset; | |
1018 | viewer_index.packet_size = packet_index.packet_size; | |
1019 | viewer_index.content_size = packet_index.content_size; | |
1020 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1021 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1022 | viewer_index.events_discarded = packet_index.events_discarded; | |
1023 | viewer_index.stream_id = packet_index.stream_id; | |
1024 | ||
1025 | send_reply: | |
1026 | viewer_index.flags = htobe32(viewer_index.flags); | |
1027 | ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, | |
1028 | sizeof(viewer_index), 0); | |
1029 | if (ret < 0) { | |
1030 | ERR("Relay index to viewer"); | |
1031 | goto end_unlock; | |
1032 | } | |
1033 | ||
1034 | DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", | |
1035 | vstream->last_sent_index, vstream->stream_handle); | |
1036 | ||
1037 | end_unlock: | |
1038 | rcu_read_unlock(); | |
1039 | ||
1040 | end_no_session: | |
1041 | end: | |
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * Send the next index for a stream | |
1047 | * | |
1048 | * Return 0 on success or else a negative value. | |
1049 | */ | |
1050 | static | |
92c6ca54 | 1051 | int viewer_get_packet(struct relay_command *cmd) |
d3e2ba59 JD |
1052 | { |
1053 | int ret, send_data = 0; | |
1054 | char *data = NULL; | |
1055 | uint32_t len = 0; | |
1056 | ssize_t read_len; | |
1057 | struct lttng_viewer_get_packet get_packet_info; | |
1058 | struct lttng_viewer_trace_packet reply; | |
1059 | struct relay_viewer_stream *stream; | |
1060 | ||
1061 | assert(cmd); | |
d3e2ba59 JD |
1062 | |
1063 | DBG2("Relay get data packet"); | |
1064 | ||
1065 | if (cmd->version_check_done == 0) { | |
1066 | ERR("Trying to get packet before version check"); | |
1067 | ret = -1; | |
1068 | goto end; | |
1069 | } | |
1070 | ||
1071 | ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, | |
1072 | sizeof(get_packet_info), 0); | |
1073 | if (ret < 0 || ret != sizeof(get_packet_info)) { | |
1074 | ret = -1; | |
1075 | ERR("Relay didn't receive the whole packet"); | |
1076 | goto end; | |
1077 | } | |
1078 | ||
1079 | rcu_read_lock(); | |
92c6ca54 | 1080 | stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1081 | if (!stream) { |
1082 | goto error; | |
1083 | } | |
1084 | assert(stream->ctf_trace); | |
1085 | ||
1086 | /* | |
1087 | * First time we read this stream, we need open the tracefile, we should | |
1088 | * only arrive here if an index has already been sent to the viewer, so the | |
1089 | * tracefile must exist, if it does not it is a fatal error. | |
1090 | */ | |
1091 | if (stream->read_fd < 0) { | |
1092 | char fullpath[PATH_MAX]; | |
1093 | ||
1094 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1095 | stream->channel_name); | |
1096 | if (ret < 0) { | |
1097 | goto error; | |
1098 | } | |
1099 | ret = open(fullpath, O_RDONLY); | |
1100 | if (ret < 0) { | |
1101 | PERROR("Relay opening trace file"); | |
1102 | goto error; | |
1103 | } | |
1104 | stream->read_fd = ret; | |
1105 | } | |
1106 | ||
1107 | memset(&reply, 0, sizeof(reply)); | |
1108 | ||
1109 | if (!stream->ctf_trace->metadata_received || | |
1110 | stream->ctf_trace->metadata_received > | |
1111 | stream->ctf_trace->metadata_sent) { | |
1112 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1113 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1114 | ||
1115 | goto send_reply; | |
1116 | } | |
1117 | ||
1118 | len = be32toh(get_packet_info.len); | |
1119 | data = zmalloc(len); | |
1120 | if (!data) { | |
1121 | PERROR("relay data zmalloc"); | |
1122 | goto error; | |
1123 | } | |
1124 | ||
1125 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1126 | if (ret < 0) { | |
1127 | PERROR("lseek"); | |
1128 | goto error; | |
1129 | } | |
1130 | read_len = read(stream->read_fd, data, len); | |
1131 | if (read_len < (ssize_t) len) { | |
1132 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1133 | stream->read_fd, be64toh(get_packet_info.offset)); | |
1134 | goto error; | |
1135 | } | |
1136 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1137 | reply.len = htobe32(len); | |
1138 | send_data = 1; | |
1139 | goto send_reply; | |
1140 | ||
1141 | error: | |
1142 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1143 | ||
1144 | send_reply: | |
1145 | reply.flags = htobe32(reply.flags); | |
1146 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1147 | if (ret < 0) { | |
1148 | ERR("Relay data header to viewer"); | |
1149 | goto end_unlock; | |
1150 | } | |
1151 | ||
1152 | if (send_data) { | |
1153 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1154 | if (ret < 0) { | |
1155 | ERR("Relay send data to viewer"); | |
1156 | goto end_unlock; | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1161 | be64toh(get_packet_info.stream_id)); | |
1162 | ||
1163 | end_unlock: | |
1164 | free(data); | |
1165 | rcu_read_unlock(); | |
1166 | ||
1167 | end: | |
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Send the session's metadata | |
1173 | * | |
1174 | * Return 0 on success else a negative value. | |
1175 | */ | |
1176 | static | |
92c6ca54 | 1177 | int viewer_get_metadata(struct relay_command *cmd) |
d3e2ba59 JD |
1178 | { |
1179 | int ret = 0; | |
1180 | ssize_t read_len; | |
1181 | uint64_t len = 0; | |
1182 | char *data = NULL; | |
1183 | struct lttng_viewer_get_metadata request; | |
1184 | struct lttng_viewer_metadata_packet reply; | |
1185 | struct relay_viewer_stream *stream; | |
1186 | ||
1187 | assert(cmd); | |
d3e2ba59 JD |
1188 | |
1189 | DBG("Relay get metadata"); | |
1190 | ||
1191 | if (cmd->version_check_done == 0) { | |
1192 | ERR("Trying to get metadata before version check"); | |
1193 | ret = -1; | |
1194 | goto end; | |
1195 | } | |
1196 | ||
1197 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, | |
1198 | sizeof(request), 0); | |
1199 | if (ret < 0 || ret != sizeof(request)) { | |
1200 | ret = -1; | |
1201 | ERR("Relay didn't receive the whole packet"); | |
1202 | goto end; | |
1203 | } | |
1204 | ||
1205 | rcu_read_lock(); | |
92c6ca54 | 1206 | stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1207 | if (!stream || !stream->metadata_flag) { |
1208 | ERR("Invalid metadata stream"); | |
1209 | goto error; | |
1210 | } | |
1211 | assert(stream->ctf_trace); | |
1212 | assert(stream->ctf_trace->metadata_sent <= | |
1213 | stream->ctf_trace->metadata_received); | |
1214 | ||
1215 | len = stream->ctf_trace->metadata_received - | |
1216 | stream->ctf_trace->metadata_sent; | |
1217 | if (len == 0) { | |
1218 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1219 | goto send_reply; | |
1220 | } | |
1221 | ||
1222 | /* first time, we open the metadata file */ | |
1223 | if (stream->read_fd < 0) { | |
1224 | char fullpath[PATH_MAX]; | |
1225 | ||
1226 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1227 | stream->channel_name); | |
1228 | if (ret < 0) { | |
1229 | goto error; | |
1230 | } | |
1231 | ret = open(fullpath, O_RDONLY); | |
1232 | if (ret < 0) { | |
1233 | PERROR("Relay opening metadata file"); | |
1234 | goto error; | |
1235 | } | |
1236 | stream->read_fd = ret; | |
1237 | } | |
1238 | ||
1239 | reply.len = htobe64(len); | |
1240 | data = zmalloc(len); | |
1241 | if (!data) { | |
1242 | PERROR("viewer metadata zmalloc"); | |
1243 | goto error; | |
1244 | } | |
1245 | ||
1246 | read_len = read(stream->read_fd, data, len); | |
1247 | if (read_len < (ssize_t) len) { | |
1248 | PERROR("Relay reading metadata file"); | |
1249 | goto error; | |
1250 | } | |
1251 | stream->ctf_trace->metadata_sent += read_len; | |
1252 | reply.status = htobe32(VIEWER_METADATA_OK); | |
1253 | goto send_reply; | |
1254 | ||
1255 | error: | |
1256 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1257 | ||
1258 | send_reply: | |
1259 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1260 | if (ret < 0) { | |
1261 | ERR("Relay data header to viewer"); | |
1262 | goto end_unlock; | |
1263 | } | |
1264 | ||
1265 | if (len > 0) { | |
1266 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1267 | if (ret < 0) { | |
1268 | ERR("Relay send data to viewer"); | |
1269 | goto end_unlock; | |
1270 | } | |
1271 | } | |
1272 | ||
1273 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1274 | be64toh(request.stream_id)); | |
1275 | ||
1276 | DBG("Metadata sent"); | |
1277 | ||
1278 | end_unlock: | |
1279 | free(data); | |
1280 | rcu_read_unlock(); | |
1281 | end: | |
1282 | return ret; | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * live_relay_unknown_command: send -1 if received unknown command | |
1287 | */ | |
1288 | static | |
1289 | void live_relay_unknown_command(struct relay_command *cmd) | |
1290 | { | |
1291 | struct lttcomm_relayd_generic_reply reply; | |
1292 | int ret; | |
1293 | ||
1294 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
1295 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1296 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1297 | if (ret < 0) { | |
1298 | ERR("Relay sending unknown command"); | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Process the commands received on the control socket | |
1304 | */ | |
1305 | static | |
1306 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
92c6ca54 | 1307 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1308 | { |
1309 | int ret = 0; | |
1310 | ||
1311 | switch (be32toh(recv_hdr->cmd)) { | |
1312 | case VIEWER_CONNECT: | |
1313 | ret = viewer_connect(cmd); | |
1314 | break; | |
1315 | case VIEWER_LIST_SESSIONS: | |
1316 | ret = viewer_list_sessions(cmd, sessions_ht); | |
1317 | break; | |
1318 | case VIEWER_ATTACH_SESSION: | |
92c6ca54 | 1319 | ret = viewer_attach_session(cmd, sessions_ht); |
d3e2ba59 JD |
1320 | break; |
1321 | case VIEWER_GET_NEXT_INDEX: | |
92c6ca54 | 1322 | ret = viewer_get_next_index(cmd, sessions_ht); |
d3e2ba59 JD |
1323 | break; |
1324 | case VIEWER_GET_PACKET: | |
92c6ca54 | 1325 | ret = viewer_get_packet(cmd); |
d3e2ba59 JD |
1326 | break; |
1327 | case VIEWER_GET_METADATA: | |
92c6ca54 | 1328 | ret = viewer_get_metadata(cmd); |
d3e2ba59 JD |
1329 | break; |
1330 | default: | |
1331 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
1332 | live_relay_unknown_command(cmd); | |
1333 | ret = -1; | |
1334 | goto end; | |
1335 | } | |
1336 | ||
1337 | end: | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | static | |
1342 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) | |
1343 | { | |
1344 | int ret; | |
1345 | ||
1346 | assert(events); | |
1347 | ||
1348 | lttng_poll_del(events, pollfd); | |
1349 | ||
1350 | ret = close(pollfd); | |
1351 | if (ret < 0) { | |
1352 | ERR("Closing pollfd %d", pollfd); | |
1353 | } | |
1354 | } | |
1355 | ||
1356 | /* | |
1357 | * Create and add connection to the given hash table. | |
1358 | * | |
1359 | * Return poll add value or else -1 on error. | |
1360 | */ | |
1361 | static | |
1362 | int add_connection(int fd, struct lttng_poll_event *events, | |
1363 | struct lttng_ht *relay_connections_ht) | |
1364 | { | |
1365 | int ret; | |
1366 | struct relay_command *relay_connection; | |
1367 | ||
1368 | assert(events); | |
1369 | assert(relay_connections_ht); | |
1370 | ||
1371 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1372 | if (relay_connection == NULL) { | |
1373 | PERROR("Relay command zmalloc"); | |
1374 | goto error; | |
1375 | } | |
1376 | ||
1377 | do { | |
1378 | ret = read(fd, relay_connection, sizeof(*relay_connection)); | |
1379 | } while (ret < 0 && errno == EINTR); | |
1380 | if (ret < 0 || ret < sizeof(*relay_connection)) { | |
1381 | PERROR("read relay cmd pipe"); | |
1382 | goto error_read; | |
1383 | } | |
1384 | ||
1385 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1386 | (unsigned long) relay_connection->sock->fd); | |
1387 | rcu_read_lock(); | |
1388 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1389 | &relay_connection->sock_n); | |
1390 | rcu_read_unlock(); | |
1391 | ||
1392 | return lttng_poll_add(events, relay_connection->sock->fd, | |
1393 | LPOLLIN | LPOLLRDHUP); | |
1394 | ||
1395 | error_read: | |
1396 | free(relay_connection); | |
1397 | error: | |
1398 | return -1; | |
1399 | } | |
1400 | ||
1401 | static | |
1402 | void deferred_free_connection(struct rcu_head *head) | |
1403 | { | |
1404 | struct relay_command *relay_connection = | |
1405 | caa_container_of(head, struct relay_command, rcu_node); | |
1406 | ||
1407 | if (relay_connection->session && | |
1408 | relay_connection->session->viewer_attached > 0) { | |
1409 | relay_connection->session->viewer_attached--; | |
1410 | } | |
1411 | lttcomm_destroy_sock(relay_connection->sock); | |
1412 | free(relay_connection); | |
1413 | } | |
1414 | ||
1415 | static | |
1416 | void deferred_free_viewer_stream(struct rcu_head *head) | |
1417 | { | |
1418 | struct relay_viewer_stream *stream = | |
1419 | caa_container_of(head, struct relay_viewer_stream, rcu_node); | |
1420 | ||
1421 | if (stream->ctf_trace) { | |
1422 | uatomic_dec(&stream->ctf_trace->refcount); | |
1423 | assert(uatomic_read(&stream->ctf_trace->refcount) >= 0); | |
1424 | if (uatomic_read(&stream->ctf_trace->refcount) == 0) { | |
1425 | DBG("Freeing ctf_trace %" PRIu64, stream->ctf_trace->id); | |
1426 | free(stream->ctf_trace); | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | free(stream->path_name); | |
1431 | free(stream->channel_name); | |
1432 | free(stream); | |
1433 | } | |
1434 | ||
1435 | static | |
92c6ca54 | 1436 | void viewer_del_streams(struct relay_session *session) |
d3e2ba59 JD |
1437 | { |
1438 | int ret; | |
1439 | struct relay_viewer_stream *stream; | |
1440 | struct lttng_ht_node_u64 *node; | |
1441 | struct lttng_ht_iter iter; | |
1442 | ||
d3e2ba59 JD |
1443 | assert(session); |
1444 | ||
1445 | rcu_read_lock(); | |
1446 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
1447 | node = lttng_ht_iter_get_node_u64(&iter); | |
1448 | if (!node) { | |
1449 | continue; | |
1450 | } | |
1451 | ||
1452 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
1453 | if (stream->session_id != session->id) { | |
1454 | continue; | |
1455 | } | |
1456 | ||
1457 | if (stream->read_fd > 0) { | |
1458 | ret = close(stream->read_fd); | |
1459 | if (ret < 0) { | |
1460 | PERROR("close read_fd"); | |
1461 | } | |
1462 | } | |
1463 | if (stream->index_read_fd > 0) { | |
1464 | ret = close(stream->index_read_fd); | |
1465 | if (ret < 0) { | |
1466 | PERROR("close index_read_fd"); | |
1467 | } | |
1468 | } | |
1469 | if (stream->metadata_flag && stream->ctf_trace) { | |
1470 | stream->ctf_trace->metadata_sent = 0; | |
1471 | } | |
1472 | ret = lttng_ht_del(viewer_streams_ht, &iter); | |
1473 | assert(!ret); | |
1474 | call_rcu(&stream->rcu_node, deferred_free_viewer_stream); | |
1475 | } | |
1476 | rcu_read_unlock(); | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Delete and free a connection. | |
1481 | * | |
1482 | * RCU read side lock MUST be acquired. | |
1483 | */ | |
1484 | static | |
1485 | void del_connection(struct lttng_ht *relay_connections_ht, | |
92c6ca54 | 1486 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
d3e2ba59 JD |
1487 | { |
1488 | int ret; | |
1489 | ||
1490 | assert(relay_connections_ht); | |
1491 | assert(iter); | |
1492 | assert(relay_connection); | |
d3e2ba59 JD |
1493 | |
1494 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1495 | assert(!ret); | |
1496 | ||
1497 | if (relay_connection->session) { | |
92c6ca54 | 1498 | viewer_del_streams(relay_connection->session); |
d3e2ba59 JD |
1499 | } |
1500 | ||
1501 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * This thread does the actual work | |
1506 | */ | |
1507 | static | |
1508 | void *thread_worker(void *data) | |
1509 | { | |
1510 | int ret, err = -1; | |
1511 | uint32_t nb_fd; | |
1512 | struct relay_command *relay_connection; | |
1513 | struct lttng_poll_event events; | |
1514 | struct lttng_ht *relay_connections_ht; | |
1515 | struct lttng_ht_node_ulong *node; | |
1516 | struct lttng_ht_iter iter; | |
1517 | struct lttng_viewer_cmd recv_hdr; | |
1518 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1519 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1520 | |
1521 | DBG("[thread] Live viewer relay worker started"); | |
1522 | ||
1523 | rcu_register_thread(); | |
1524 | ||
1525 | /* table of connections indexed on socket */ | |
1526 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1527 | if (!relay_connections_ht) { | |
1528 | goto relay_connections_ht_error; | |
1529 | } | |
1530 | ||
1531 | ret = create_thread_poll_set(&events, 2); | |
1532 | if (ret < 0) { | |
1533 | goto error_poll_create; | |
1534 | } | |
1535 | ||
1536 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1537 | if (ret < 0) { | |
1538 | goto error; | |
1539 | } | |
1540 | ||
1541 | restart: | |
1542 | while (1) { | |
1543 | int i; | |
1544 | ||
1545 | /* Infinite blocking call, waiting for transmission */ | |
1546 | DBG3("Relayd live viewer worker thread polling..."); | |
1547 | ret = lttng_poll_wait(&events, -1); | |
1548 | if (ret < 0) { | |
1549 | /* | |
1550 | * Restart interrupted system call. | |
1551 | */ | |
1552 | if (errno == EINTR) { | |
1553 | goto restart; | |
1554 | } | |
1555 | goto error; | |
1556 | } | |
1557 | ||
1558 | nb_fd = ret; | |
1559 | ||
1560 | /* | |
1561 | * Process control. The control connection is prioritised so we don't | |
1562 | * starve it with high throughput tracing data on the data | |
1563 | * connection. | |
1564 | */ | |
1565 | for (i = 0; i < nb_fd; i++) { | |
1566 | /* Fetch once the poll data */ | |
1567 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1568 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1569 | ||
1570 | /* Thread quit pipe has been closed. Killing thread. */ | |
1571 | ret = check_thread_quit_pipe(pollfd, revents); | |
1572 | if (ret) { | |
1573 | err = 0; | |
1574 | goto exit; | |
1575 | } | |
1576 | ||
1577 | /* Inspect the relay cmd pipe for new connection */ | |
1578 | if (pollfd == live_relay_cmd_pipe[0]) { | |
1579 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1580 | ERR("Relay live pipe error"); | |
1581 | goto error; | |
1582 | } else if (revents & LPOLLIN) { | |
1583 | DBG("Relay live viewer command received"); | |
1584 | ret = add_connection(live_relay_cmd_pipe[0], | |
1585 | &events, relay_connections_ht); | |
1586 | if (ret < 0) { | |
1587 | goto error; | |
1588 | } | |
1589 | } | |
1590 | } else if (revents) { | |
1591 | rcu_read_lock(); | |
1592 | lttng_ht_lookup(relay_connections_ht, | |
1593 | (void *)((unsigned long) pollfd), &iter); | |
1594 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1595 | if (node == NULL) { | |
1596 | DBG2("Relay viewer sock %d not found", pollfd); | |
1597 | rcu_read_unlock(); | |
1598 | goto error; | |
1599 | } | |
1600 | relay_connection = caa_container_of(node, struct relay_command, | |
1601 | sock_n); | |
1602 | ||
1603 | if (revents & (LPOLLERR)) { | |
d3e2ba59 JD |
1604 | cleanup_poll_connection(&events, pollfd); |
1605 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1606 | relay_connection); |
d3e2ba59 JD |
1607 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1608 | DBG("Viewer socket %d hung up", pollfd); | |
1609 | cleanup_poll_connection(&events, pollfd); | |
1610 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1611 | relay_connection); |
d3e2ba59 JD |
1612 | } else if (revents & LPOLLIN) { |
1613 | ret = relay_connection->sock->ops->recvmsg( | |
1614 | relay_connection->sock, &recv_hdr, | |
1615 | sizeof(struct lttng_viewer_cmd), | |
1616 | 0); | |
1617 | /* connection closed */ | |
1618 | if (ret <= 0) { | |
1619 | cleanup_poll_connection(&events, pollfd); | |
1620 | del_connection( relay_connections_ht, &iter, | |
92c6ca54 | 1621 | relay_connection); |
d3e2ba59 JD |
1622 | DBG("Viewer control connection closed with %d", |
1623 | pollfd); | |
1624 | } else { | |
1625 | if (relay_connection->session) { | |
1626 | DBG2("Relay viewer worker receiving data for " | |
1627 | "session: %" PRIu64, | |
1628 | relay_connection->session->id); | |
1629 | } | |
1630 | ret = process_control(&recv_hdr, relay_connection, | |
92c6ca54 | 1631 | sessions_ht); |
d3e2ba59 JD |
1632 | if (ret < 0) { |
1633 | /* Clear the session on error. */ | |
1634 | cleanup_poll_connection(&events, pollfd); | |
1635 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1636 | relay_connection); |
d3e2ba59 JD |
1637 | DBG("Viewer connection closed with %d", pollfd); |
1638 | } | |
1639 | } | |
1640 | } | |
1641 | rcu_read_unlock(); | |
1642 | } | |
1643 | } | |
1644 | } | |
1645 | ||
1646 | exit: | |
1647 | error: | |
1648 | lttng_poll_clean(&events); | |
1649 | ||
1650 | /* empty the hash table and free the memory */ | |
1651 | rcu_read_lock(); | |
1652 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
1653 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1654 | if (!node) { | |
1655 | continue; | |
1656 | } | |
1657 | ||
1658 | relay_connection = caa_container_of(node, struct relay_command, | |
1659 | sock_n); | |
92c6ca54 | 1660 | del_connection(relay_connections_ht, &iter, relay_connection); |
d3e2ba59 JD |
1661 | } |
1662 | rcu_read_unlock(); | |
1663 | error_poll_create: | |
1664 | lttng_ht_destroy(relay_connections_ht); | |
1665 | relay_connections_ht_error: | |
1666 | /* Close relay cmd pipes */ | |
1667 | utils_close_pipe(live_relay_cmd_pipe); | |
1668 | if (err) { | |
1669 | DBG("Viewer worker thread exited with error"); | |
1670 | } | |
1671 | DBG("Viewer worker thread cleanup complete"); | |
1672 | stop_threads(); | |
1673 | rcu_unregister_thread(); | |
1674 | return NULL; | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * Create the relay command pipe to wake thread_manage_apps. | |
1679 | * Closed in cleanup(). | |
1680 | */ | |
1681 | static int create_relay_cmd_pipe(void) | |
1682 | { | |
1683 | int ret; | |
1684 | ||
1685 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); | |
1686 | ||
1687 | return ret; | |
1688 | } | |
1689 | ||
1690 | void live_stop_threads() | |
1691 | { | |
1692 | int ret; | |
1693 | void *status; | |
1694 | ||
1695 | stop_threads(); | |
1696 | ||
1697 | ret = pthread_join(live_listener_thread, &status); | |
1698 | if (ret != 0) { | |
1699 | PERROR("pthread_join live listener"); | |
1700 | goto error; /* join error, exit without cleanup */ | |
1701 | } | |
1702 | ||
1703 | ret = pthread_join(live_worker_thread, &status); | |
1704 | if (ret != 0) { | |
1705 | PERROR("pthread_join live worker"); | |
1706 | goto error; /* join error, exit without cleanup */ | |
1707 | } | |
1708 | ||
1709 | ret = pthread_join(live_dispatcher_thread, &status); | |
1710 | if (ret != 0) { | |
1711 | PERROR("pthread_join live dispatcher"); | |
1712 | goto error; /* join error, exit without cleanup */ | |
1713 | } | |
1714 | ||
1715 | cleanup(); | |
1716 | ||
1717 | error: | |
1718 | return; | |
1719 | } | |
1720 | ||
1721 | /* | |
1722 | * main | |
1723 | */ | |
1724 | int live_start_threads(struct lttng_uri *uri, | |
1725 | struct relay_local_data *relay_ctx) | |
1726 | { | |
1727 | int ret = 0; | |
1728 | void *status; | |
1729 | int is_root; | |
1730 | ||
1731 | assert(uri); | |
1732 | live_uri = uri; | |
1733 | ||
1734 | /* Create thread quit pipe */ | |
1735 | if ((ret = init_thread_quit_pipe()) < 0) { | |
1736 | goto error; | |
1737 | } | |
1738 | ||
1739 | /* Check if daemon is UID = 0 */ | |
1740 | is_root = !getuid(); | |
1741 | ||
1742 | if (!is_root) { | |
1743 | if (live_uri->port < 1024) { | |
1744 | ERR("Need to be root to use ports < 1024"); | |
1745 | ret = -1; | |
1746 | goto exit; | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | /* Setup the thread apps communication pipe. */ | |
1751 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
1752 | goto exit; | |
1753 | } | |
1754 | ||
1755 | /* Init relay command queue. */ | |
1756 | cds_wfq_init(&viewer_cmd_queue.queue); | |
1757 | ||
1758 | /* Set up max poll set size */ | |
1759 | lttng_poll_set_max_size(); | |
1760 | ||
1761 | /* Setup the dispatcher thread */ | |
1762 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
1763 | thread_dispatcher, (void *) NULL); | |
1764 | if (ret != 0) { | |
1765 | PERROR("pthread_create viewer dispatcher"); | |
1766 | goto exit_dispatcher; | |
1767 | } | |
1768 | ||
1769 | /* Setup the worker thread */ | |
1770 | ret = pthread_create(&live_worker_thread, NULL, | |
1771 | thread_worker, relay_ctx); | |
1772 | if (ret != 0) { | |
1773 | PERROR("pthread_create viewer worker"); | |
1774 | goto exit_worker; | |
1775 | } | |
1776 | ||
1777 | /* Setup the listener thread */ | |
1778 | ret = pthread_create(&live_listener_thread, NULL, | |
1779 | thread_listener, (void *) NULL); | |
1780 | if (ret != 0) { | |
1781 | PERROR("pthread_create viewer listener"); | |
1782 | goto exit_listener; | |
1783 | } | |
1784 | ||
1785 | ret = 0; | |
1786 | goto end; | |
1787 | ||
1788 | exit_listener: | |
1789 | ret = pthread_join(live_listener_thread, &status); | |
1790 | if (ret != 0) { | |
1791 | PERROR("pthread_join live listener"); | |
1792 | goto error; /* join error, exit without cleanup */ | |
1793 | } | |
1794 | ||
1795 | exit_worker: | |
1796 | ret = pthread_join(live_worker_thread, &status); | |
1797 | if (ret != 0) { | |
1798 | PERROR("pthread_join live worker"); | |
1799 | goto error; /* join error, exit without cleanup */ | |
1800 | } | |
1801 | ||
1802 | exit_dispatcher: | |
1803 | ret = pthread_join(live_dispatcher_thread, &status); | |
1804 | if (ret != 0) { | |
1805 | PERROR("pthread_join live dispatcher"); | |
1806 | goto error; /* join error, exit without cleanup */ | |
1807 | } | |
1808 | ||
1809 | exit: | |
1810 | cleanup(); | |
1811 | ||
1812 | end: | |
1813 | error: | |
1814 | return ret; | |
1815 | } |